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What is PECS (Producer Extends Consumer Super)?
I came across PECS (short for Producer extends and Consumer super ) while reading up on generics.
14 Answers
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You can't specify target table for update in FROM clause
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The problem is that MySQL, for whatever inane reason, doesn't allow you to write queries like this:
UPDATE myTable
SET myTable.A =
(
SELECT B
FROM myTable
INNER JOIN ...
)
That is, if you're doing an UPDATE/INSERT/DELETE on a table, you ...
ActiveRecord: size vs count
... If size adapts to the situation anyway, then what need is there for length and count at all?
– sscirrus
May 21 '11 at 17:32
27
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How do I ignore files in Subversion?
...lesystem.
Ignored files are specified by a "file pattern". The syntax and format of file patterns is explained in SVN's online documentation: http://svnbook.red-bean.com/nightly/en/svn.advanced.props.special.ignore.html "File Patterns in Subversion".
Subversion, as of version 1.8 (June 2013) and l...
Is there any advantage of using map over unordered_map in case of trivial keys?
...t unordered_map in C++ made me realize that I should use unordered_map for most cases where I used map before, because of the efficiency of lookup ( amortized O(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got no problems with ...
Using Spring MVC Test to unit test multipart POST request
I have the following request handler for saving autos. I have verified that this works when I use e.g. cURL. Now I want to unit test the method with Spring MVC Test. I have tried to use the fileUploader, but I am not managing to get it working. Nor do I manage to add the JSON part.
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Android Layout with ListView and Buttons
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I think this is what you are looking for.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<Button a...
How to change the style of the title attribute inside an anchor tag?
... doesn't work properly in FF if instead of the tag a use the tag, for instance, td
– dnim
Sep 27 '12 at 10:26
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Best way to get child nodes
...hite space text nodes are always included in the DOM (except in IE < 9) for both HTML and XHTML, wherever they appear in the source. It's generally a good thing, although it can catch you out if you're not prepared for it.
– Tim Down
Apr 30 '12 at 10:32
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How can I stop .gitignore from appearing in the list of untracked files?
...to your repo, and someone clone your repo, they won't get the commit hook, for example.
– August Lilleaas
Mar 13 '10 at 6:51
91
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